Rotary-hook sewing-machine.



W. N. PARKES.

ROTARY HOOK SEWING MACHINE.

APPLICATION "LED MAY 2. i9l4. 1 ,188,818. Patented June 27,1916.

3 suns-shin I.

WITNESSE r w. N. PARKES. nomw HOOK sEwmc MACHINE.

. APPLICATION FILED MAY 2. m4. 1,188.818. Patented June 27, 1916.

' 3SIIEEIS-SHEET-2.

W. N. PARKES.

ROTARY HOOK SEWING MACHINE.

' ARPucAHon FILED Patented June 27, 1916.

3 SHEETS-SHEET 3 Ill/VENTOR By W ATTORNEY HAY 2.1914.

' UNITED STATESAPATENT oFIneE.

"Wzt-LLIAM- AN}; BARKESf F ROOKLYN; NEW; YORK; ASSIGNORQT'O flHEis-ENGER :M'ANU- "FACTURING-COMPANY a CQRPORATIEON on. NEW iTEiiSEY.

wen-136 wmeMAcHme;

tat-88 ,31 s2;

i Application filed May 2,1914. Serial No. 835,843.

Trial; whom it may concern:

.X "York, have invented certain new and" useful Iinprb ements inRotary-Hook 'SewingMachines, of which the following is 'a s ')e citicatioli reference being bad therein' to the accompanying drawings.;Tlri'si n\'ention relates to look-stitch sewing machines, and moreparticularly of that type. 'disclosed}:ifn'- my ij itited States Patenti No. T301392, of'June t), 1903. According to said patent, theloop-seizing hook and the jbobbm-ease are constructed to accommodate amass of lower thread of maximum size 'with' the ordinary amount ofneedle-thread loop distention, with the result of producing a lowerthread f'capacity greatly exceeding that of otliei lot-li-stiteli'loop-taker mechanifsnis in' conjunction with take-up mechanism.o f thesame capacity or range. of ac- ,-t1on. ,Tl'ns increased bobbin capacitymay i i cycles be therefore secured, without any additional reering ofthe i ieedle-thread through the needle-eye -ll'l the loop-distendmg andtakeup actions of the successive stitch-forming As disclosed in "saidpatent the loopseizing hook is adaptedlfor rotary movement only uponanaxis substantially parallel with the reciprocating needle,' and theprimary .objectof. the present invention is to proyide a loop-takerhaving the advantages of the same but capable of embodiment 1n varionsclasses of' sewingr machines. andparticularlfifithose provided with aloop-taker ae [tuatin g shaft disposed transverse to the needle-path. orparallel with the work-supporting plate. Ithas for a-turther object toeffect the i delivery of the needle-thread loop from the "loop-takerafter a baoptasting operation so I asto insurc t'reedmn from kinks andtwists,

and to thus prevent the formation of loose loops upon the under face ofthe work after e'ad-carity and with an external' loopgj'd efiectin gpart extending into circum'feren )fiilllfll with a beak having its pointat the V restrained against; movement therewith, has attached at or nearits'b'ottom or rearward end a loop-distending beak entering anrannularchannel 1n the wall of the rotary member extending through said beak andlying across the path of moi'ement of said throat. v

In practice'the beak of the hook may be formed by providing an :inclinedslot -ex tending from the forward end of the hookbody to a positionadjacent the bottom of the thread-case, a loopstop being extended fromthe inclined loqr-deflecting. edge of the beak so as to form athroattherefor at the end of its operatifie'portion intermediate the ends of.thjejbobbin-ease, while the remainder of the 'im-Iined slot-affordsclearance for the'thread-loop drawnfbacknmrdly to the bottom of thethread-case by engagement with the l'oop-distending beak. The hook isconstructedaritli a tail or loop-discharging poiutat its ,t'orw'ardenddirected oppositely to the ,bee k, the intervening space beingtemporarily bridged over by 11 lat eral loop-absor ing guard-flangeformed upon the thread-case and overhanging the forward end of thehook-body. By this means. as the hook nears the completion ot the firstof it plural rotationsduring-each ncc dlc-rct'iproeatiou. 1 thethreaddoop cast about the bobbin-case'is drawn by the takcup off thebeak and upon the tail of the book from which itis subsequently releasedand drawn up into the work.

The lornrabsorbing flange has preferably an upwardly extending dischargefinger whose point enters a pocket in-,the bottom of the throat-platewhich 1'ane ,.-,i formed with a loop-controlling spur inclined down--\\'ardly in the direction.o'tj uo'tion of the loop-taker beak whenperforn'iiug its loopseiizing action. The thread-case has a"se -ond beakor projection circumfercnt ally spaced rim t e "16F ettin sta r in whichFigure 1 is an elevation of a sewing machine embodying the presentimprovement and Fig. 1 is a detail view of the driving means for theloop-taker shaft. Fig. 2 is an end view of the lower portion of themachine upon a larger scale and with the bedplate in transverse section.Figs. 3 and 4 are edge views of the thread-case with certain partsomitted and taken from different sides, and Fig. 5 a plan of the same.Figs. 6 and 7 are side views of the loop-taker complete, showing thethread-loops in different stages of the stitch-forming cycle. Figs. 8and 9 are sectional views respectively, of the bobbin and thread-case,Fig. 10 a side view, partly in section, of the loop-seizing member, Fig.11 an edge view of the disk or washer provided with the loop-distendingand loop detaining beaks, and Fig. 12 a sectional side view partly insection, of the loop-taker sustaining plate which is in practice securedin the forward end,of the hook-shaft. Fig. 13 is a side view of thethread-case complete, and Fig. 11 a face view of the entire loop-taker,including the loop-seizing memher and thread-case. Fig. 15 is asectional elevation of a portion of the work-plate, the loop-taker andmeans for restraining the thread-case against rotation. Fig. 16 is adetail view. of the rotation-restraining means of the thread-case. Fig.17 is a transverse sectional elevation of the loop-seizing member,showing the operative parts from the inside. Figs. 18 and 19 arerespectively top and bottom plan views of the throatplate, and Fig. 20an edge view of the throat-plate with its loop-controlling spur andparts of the loop-taker cooperating therewith. Fig. 21 is a detail viewof the inner face of the loop-absorbing guard of the thread-case, Fig.22is a face view of one form of lower-thread tension-spring, and Fig. 23 adetail of the contact stud of said tension-spring. Fig. 21 is an edgeview of an alternative form of tension-spring.

The presentimprovements are shown embodied in a Singer l o. GllV machinecon structed with a frame comprising the bedplate 1 and overhangingbracket-arm 2 in .which is journaled the main-shaft 3 which in practicehas a driving connection with the reciprocating needle-bar 4 carryingthe needle 5. The'take-up is or may be of the link type comprising thevibratory taketudinally of the bed-plate 1. By the means thus described,the loop-taker shaft receives two rotations for each rotation of themainshaft, and hence for each reciprocation of the needle.

As represented in dotted lines in Fig. 15, the forward end of thehook-shaft 13 is formed withan axial socket in which is se- 7 cured thepin 14 forming the stem of the loop-taker sustaining plate or disk 14")formed with the annular shouldered flange 16. The cylindrical body ofthe loop-seizing member is formed in its forward end with the concentricouter and inner shells 17 and 18 with an intermediate annular channel19, the inner shell being laterally recessed in its forward portion toform the bobbin-case sustaining ledge or seat 20 of the axialthread-cavity inclosed by the inner shell 18. The inner wall ofthe'hook-shell- 17 is fitted at its rearward end to the supportingflange 16 to which it is secured by screws 2]. I

The hook-shell has in one side extending divergently from the forwardend the inclined slots 22 and 23 forming respectively the loop-seizingbeak 21 and the loop-discharging point or tail 25 whose points aredisposed at the forward end of the loopseizing member and are oppositelydirected and slightly spaced apart circiunferentially. Extending acrossthe slot 22 intermediate its ends is the transverse bridge-piece 20forming with the adjacent walls of the recess between the beak and taila throat to receive one limb of the needle-thread loop seized by thebeak 21. The bridge-piece 26 is cut out slightly in its inner face at 26where it crosses the slot 22 to afford clearance for the thread-loop, asindicated in Figs. 6, 10 and 11. The forward edge of the outerhook-shell is peripherall beveled throughout nearly its circumference toafford a cast-off incline 17 having its discharge edge incircumferential 'alinement with the point of the beak by which the outerlimb of a needlethread loop engaged by the bridge-piece 26 is deflectedover the end of the hook-body.

The body 27 of the thread-case is cylindrical in form with closedrearward end and provided adjacent its outer end with the annular flange28 fitted to and journaled upon which the bearing of the thread-case inthe hook-body may be kept lubricated without the loss of lubricant bycentrifugal action common to constructions in which the oil receptacleor cavity is disposed in the retating part.

The tlange 28 is discontinued for a small portion of the circumferenceat one side to form a recess or pocket 28 adjacent which it is providedwith a peripheral series of narrow inclined slits 29 which in practicesoon become packed with lint which absorbs lubricant from the surface ofthe flange and serves to distribute the same and maintain the operativesurface properly lubricated in the continued use of the machine.

Secured rigidly to the bottom or rearward end of the thread-case bymeans of a screw 30, entering the threaded aperture 31 in the bottom ofthe thread-case, and the dowel-pin 32 which also enters a suitableaperture of the thread-case, is the disk or washer with its outerportion seated upon the adjacent end of the inner hook-shell 18 by meansof which the thread-case is contined in position within thethread-cavity of the hook with its flange 28 seated upon the supportingledge 20 of the hook-body. The disk 33 has extending outwardly from itsperiphery the loop-distending beak 34 inclined relatively to the axis ofmovement in the opposite direction to the slot 32 and adjacent operativeloop-distcnding edge -of the beak 24; and circumferentially spaced fromsaid beak 3+ and projecting outwardly from the same face of the disk isthe shorter loop-detaining beak or projection Both of these projectingmembers 81 and 35 are arranged for operation within the annular channel19 of the hook-body.

Sustained upon the bottom of the threadcase is the tubular axialbobbin-sustaining post so adapted to receive the tubular hub 37 of thediskbobbin of well-known form from which the lower thread is led throughthe inclined delivery slit 38 in the wall of the bobbin-case. this slitbeing inclined oppositely to the hook-slot 22, as represented in Fig. T.The bearing tiange 28 is cut out at 32) where it crosses the thread-slit38 adjacent the periphery of the thread-case to afford clearance for thethread issuing from V said slit.

thread-case extension is secured by means of fastening screws 43 and itthe segmental guard-member 45 having the angularly disposed curvedloop-absorbing flange 46 extending laterally therefrom and overhangingthe bearing flange 2 and the outer extremity of the hook-body. asrepresented more particularly in Fig. 7. The guard 45 has upon its innerface the boss 15 by means of which the surface of the guard is spacedslightly from the thread-case extension 40 to admit the thread. Theloopguard 15 terminates at one end in the substantially radialloop-discharging finger 17 into which the adjacent end of the flange l6merges. The point of the finger l7 preferably enters a cavity 48extending laterally from the needle-aperture 49 of the throatplate 50which is provided with the usual feed-dog apertures 51 entered by theserrated feed points 52 of the feed-dog 53 carried by the feed-bar 54which is or may be actuated in any suitable or usual manner.

Depending from the bottom of the throatplate is the down 'ardly inclinedloop-controlling spur extending in the direction of movement of theloop-taker beak and in the direction of feed toward and having itsextremity spaced slightly from the loopdischarging finger 17, asrepresented particularly in Figs. 19 and '20. The form of this spur isnot material excepting that its lower operative face should be inclineddownwardly and its extremity should be directed to'and spaced slightlyfrom the part of the finger 17 intermediate the ends. so as to cooperatewith such finger inreccivmg the needle-threzul loop'under the action ofthe takeup to insure ,its freedom from twists and its proper depositupon the finger 1T preparatory to its final discharge therefrom in beingdrawn up into the fabric.

The guard 45 has upon its outer face the boss so having a threadedaperture entered by the tension-screw 57 which passes through anaperture in thearched tension-spring 53 with one extremity resting uponthe guard 45 and the other provided with a key-hole slot 59. Asrepresented in Figs. 13. .52 and :23. the slot 39 embraces the neckedstud 60 of a contact block 61 passing through an aperture 62 of theguard 45 and normally resting upon the adjacent face of the threadcaseextension 40 intermediate the pockets t1 and +2. The guard 45 has uponits inner face at opposite sides of the aperture 2 the studs orprojections 42:: and M. with their extremities entering and slightlyspaced from the bottoms of the pockets +1 and 1') and provided with thethrezul-guiding nicks or grooves H5 in angular arrangement so as toreccire the under thread from the threadglit :28 and direct the sameacross the aperture H2 beneath the tension-block G1. and upon theloop-discharging finger 1T.

As represented more particularly in Figs. 20 and 2 1, the tension-spring58 may have its operative end oifset inwardly to form a contact element58' in lieu of the block 61 for applying a drag upon the threadintermediate the guide-studs 63 and 6 The outer end of the thread-caseis provided with the forwardly projecting lugs 66 having the notches 67which are entered by the concentrically arranged and opposed fingers 68of the escapement yoke 69 fixed upon the forward end of the rockfshaft70. This rock-shaft is suitably journaled in the bearing sleeve 71 ofthe bearing lug'72 depending from the bed-plate and has secured upon itsopposite end the crank-arm 73 formed with the yoke 7% within which isfitted the slide-block 75 embracing the actuating eccentric 76 upon thehook-shaft 13.

The rocking yoke constitutes, in conjunction with the notched lugs 66,an escapement by means of which the thread-case is restrained againstmovement with the loopseizing member in a manner well-known, thethread-case being engaged alternately by the fingers 68 of the yoke 69,which are successively retracted to permit the free passage of theneedle-thread loop in the loopcasting operation. As represented in thedrawings, the loop-guard 45 is formed with an opening 77 through whichone of the yoke-fingers 68 moves in performing its function.

As represented more particularly in Fig. 9, the tubularbobbin-supporting post 36 has slidingly fitted therein the plug 78having an inclined forward end and provided in its opposite end with a.s'ocket embracing one end of a spring 7 9 whose opposite end 'restsupon the bottom of the thread-case. The plug 78 has secured to one sidea spline or feather 8O entering a slot in and extending endwise of thepost 36 and provided with a laterally extending bobbin-engaging stud 81which is adapted to enter a radial slot 82in the bottom'of thethread-case. The post 36 has in its outer end a trans- "erse fulcrum pin83 upon which is mounted the cam-shaped hub portion 84. of thebobbin-confining finger-lever 85 which is .normally turned intotransverse relation with the post as represented in Fig. 1, in whichposition the cam-portion Si presses the plug 75 backwardly in oppositionto the spring 79 to maintain the e ecting lug 8 0 within the slot 82;but when the lever 85 is turned into releasing position, as representedin Fig. 9, the plug 78 is permitted to advance under the action of itsspring 79, carrying with it the lug 81 whose engagement with the hub ofthe bobbin serves to eject the same sufficiently to be readily graspedby the operator.

In the use of the machine, the upper thread n is led in the usual mannerfrom the source of supply through various guides to the tension device86 and thence through the usual aperture of the take-up arm 6 to theneedle-eye. The bobbin having been inserted and locked within thethread-case, its thread if is passed through the open end of thethread-slit 38 and under the apertured portion of the bearing flange 28and through the taper passage 87 between the reduced wall of thethread-case extension 40 adjacent the threading slit 38 and the innerface of the guard 45. It is thence drawn beneath the rounded ends of thestuds 63 and 6i and within their respective slots underneath theoperative end of the tensionspring emerging from between the extremitiesof the parts -l0 and 45 from which it is led upwardly over the face ofthe dischargefinger l7 adjacent its junction with the extremity of theguard-flange 46 from which it is led through the needle-hole of thethroatplate.

The needle having descended through the fabric and begun its rise, aloop is entered by the beak of the hook and upon its encounter with theloop-stop 26 is carried thereby toward the'rear of the machine, or inthe direction of feed, and downwardly from the throat-plate. Immediatelyafter the encounter of the loop-stop by the outer limb of thethread-loop upon the beak just beyond the bobbincase flange 28intermediate the ends of the thread-cavity (Fig. 6), the inner limb ofthe thread-loop is engaged by the stationary loop distending beak 34which rapidly forces it backwardly along the clearance portion of theslot 22 to the lower face of the disk or washer 83. The outer limb ofthe thread-loop leading to the under face of the fabric in the meantimeencounters the beveled cast-off part 17' of the outer hook-shell, whichforces it over the forward edge of the hook, as represented in Fig. 6.

As the hook continues its rotation, the

needle-thread loop thus distended is car'- ried over the thread-case tocast-off position slightly beyond that represented in Fig. 2, at whichpoint the take-up begins its operative movement. To prevent an excess ofslack in the thread-loop in the period of action of the take'up, it isdrawn or'er the loop-guard soon after leaving cast-off position, and asthe take-up continues to act the loop is reduced and at the same timethe loop guard-flange l6 acts as a bridge between the opposed points ofthe beak 24 and tail 25 for transfer of the thread-loop from the formerto the latter, being detained in the throat of the latter adjacent theclosed end of the thread'case. As the inner limb of the thread-loopremains confined between the loop-distending hook 34 and loop-detainingpoint 35 of the disk 33 rearward of the closed end of the bobbin-case,it remains treat of the tail 25 from the detainer :35

opens a passage. between them for release ot' .thenow greatly reduced,threadloop.

As the take-up action continues the thread-loop is drawn oil the pointof the tail around the discharge-linger ll and adjacent portion of thellange ll) upon which it is yieldingly detained by the dependingthroat-plate spur of) entering the angle be tween them. The continuedcontraction of the tlllttltl-ltnll) causes it to be drawn un der thepoint of the spur 53 and between it and the finger 47 and thus upwardlybetween the point of the discharge-linger aml the recessed under face ofthe throat-plate from which it passes up into the fabric. lt is to beunderstood that in the initial stage of the loop-casting action therearward tinger GS of the escapement yoke is retracted from thethread-case to permit the loop to pass between them. and that during thesubsequent take-up action such linger returns to engagement with thetln'cathcase and the corresponding linger ol' the other arm of the yokeis retracted to release the thread-loop in the action thereon by thetake-up.

As means are provided according to the present invention tor forciblyrestraining the outer limb ol the heedlwlbrcml loop against beingcarried to the rearward portion of the hook-body and tor dellccting itover the forward edge of the same while the inner limb of thethread-loop is l'orcibly dis tended rearward of the thread-cavity andthe thrtaul-case journalcd therein. it will be seen that the presentlooptal\'er is adapted for employment in machines wherein the loop-takerturns upon an axis transverse to the needle-path or horizontal as wellas in machines wherein the axis of movement of the loop-taker isparallel with the needle path or vertical.

\Yhile the improvement is specil'ically shown and described herein in apreferred embodiment, it will be observed that its various features areadapted for employment in ditl'erent arrangements and combinations andare susceptible of individual modification both in form and constructionwithin the scope of the, present invention.

As will be observed. especially by reference to Fig. 3. one of theleading characteristics of the present looptaker is the means whereby inthe initial quadrant of rotation of the loi'ip-seizing member athread-loop is distended from a point intermediate the ends of thethread-ease in opposite directions over the ends of the thread-case; thequick distention of the thread-100p thus avoiding its enlargentent toany considerable degree by overlying the outer periphery ot' the hookpreparatory to casting over the ends ot' the thread-case.

I wish it to be understood that each and all ol the novel constructivet'catures ot' the loop-taker and other thread-hamlling means hereinshown and described are of my invention,

Having thus set torth the nature of the invention. what I claim hereinis:-

l. A sewing machine loop-taker comprising a rotary loop-seiZing memberformed with a llllttttl ttl\'lt having a bearing shoulder adjacent oneend and provided with a beak having its point at said end at one side ofsaid shoulder and its throat adjacent and at the opposite side of saidshoulder and with a cast-ott part having its discharge edge extendedinto circumt'erential alinement with the point of said beak. athreadcase within and supported upon said bcar ing shoulder ot theloop-seizing member, aml a loop-distondi'ng beak restrained againstrotation with said member and ex tending across the path ot movement ofsaid throat toward the bottom ot' the thrtaida'avity and adapted toengage one limb of a thread-loop seized by said beak and arrestedthereon by said throat near said end ot the loop-seizing member and tocarry it to the bottom of the thrcad-case for he cash ing operation. it2. sewing machine looptakei' compri? ing a rotary loop-seizing membertormed with a thread-can ity having a bearing shoul der adjacent one endand provided with a beak having its point at said end at one side ofsaid shoulder and its throat adjacent and at the opposite side of saidshoulder and intermediate said throat and said end of the loop-seizingmember from the bottom of the threada'ase and adapted to engage one limbof a thlcadl0op seized by said beak and an rested thereon by said throatnear said end of the loop-seizing member'and to carry it. to the bottomof the thread-case for the easting operation.

In a sewing machine, the combination with .a needle, ot' a cyliidricalloop-seizing member movable upon ,an axis at an angle with said needleand having means for seizing a needle-thread looio at one of itsextrejnities and distending it through a portion of the lengt of saidmember, and auxiliary spreadm means for seizing said partially distendedloop intermediate the ends of said member and completing its distentionlengthwise of the latter, and a thread-case within said member overwhich said loop is cast.

4. A sewing machine loop-taker comprising a rotary loop-seizing memberhaving an axial thread-c'avity and a surrounding annular channel withinits lateral wall and a loop-seizing beak entered by said channel andextending throughoutsubstantially the depth of the thread-cavity, aloop-stop being applied to said beak intermediate its point and base andloop-deflecting means being provided upon said member intermediate saidloop-stop and the end of said member adjacent the point of the beak, athreadcase within said loop-seizing member, and a loop-distending beakrestrained against rotation with said member and extending across thepath of movement of said loopstop within said channel toward the bottomof the thread-cavity to a point adjacent the bottom of the thread-case.

5. A sewing machine loop-taker comprising a cup-shaped rotaryloop-seizing member having an axial thread-cavity and a surroundingannular channel, within its lateral wall and a circumferentiallyinclined slot extending through its wall across said channelsubstantially throughout the depth of the thread-cavity to form aloop-seizing beak, said member having a loop-stop crossing said slot toarrest one limb of a threadloop seized by the beak. and means upon theexterior of said member for deflecting said limb of the thread-loop overthe end of said member, a thread-case within said loopseizing member.and a loop-distending beak restrained against rotation with said memberand extending across the path of movement of said loop-stop within saidchannel toward the bottom of the thread-cavity to a point adjacent thebottom of the threadcase.

6. A cup-shaped loop-seizing member for sewing machines formed with anaxial thread-cavitv and a surrounding annular channel within its lateralwall and with a loop-seizing beak entered by said channel and extendingthroughout substantially the depth of the thread-cavity, a loop-stopattached to said beak close to its loop-distending edge and iatermediateits point and base and nearer to the point than to the base of the beakto form a throat for arrest of the outer limb of a thread-loop upon thebeak,

a circumferentially inclined slot extending M body close to andintermediate the ends 04f said slot and nearer to the point than to thebase of the beak for arrest of the outer limb of a thread-loop upon thebeak, and cast-oft means upon the exterior of said member intermediatethe loop-stop and the end of said member adjacent the point of the beak.

8. A cup-shaped loop-seizing member for sewing machines formed with anaxial thread-cavity and a surrounding annular channel Within its lateralwall and with a loop-seizing beak entered by said channel and extendingthroughout substantially the depth of the thread-cavity, the outer endof said member being provided with a peripherally inclined cast-offsurface, and a loopstop applied to said beak intermediate its point andbase.

9. In a sewing machine, the combination with a reciprocating needle, ofa loop-taker comprising a cup-shaped rotary loop-seizing member movableupon an axis transverse to said needle having an axial thread-cavityprovided with an annular bearing shoulder and a surrounding annularchannel within its lateral wall and a loop-seizing beak entered by saidchannel with its point in front of said bearing shoulder and its throatupon the opposite side of and close to said bearing shoulder, athread-case ournaled upon said bearing shoulder within thetliread-cavitv.

and a loop-distending beak restrained against rotation with said memberand extending across the path of movement of said throat toward thebottom of the threadcavity to a point adjacent the bottom of thethread-case.

10. A sewing machine loop-taker comprising a cup-shaped r0tar vloop-seizing member having an axial thread-cavity provided with anannular bearing shoulder and a surrounding annular channel within itslateral wall and a loop-seizing beak entered by said channel with itspoint in front of said heating shoulder and its throat upon the oppositeside of and close to said bearing shoulder intermediate the ends of thethreadcavity, a thread-case journaled upon said bearing shoulder withinthe thread-cavity. and a loop-distending beak sustained by saidthread-case and extending from the bottom of the latter'across the pathof movement of said throat.

11. A loop-seizing member for sewing machines constructed withoppositely directed loop-seizing beak and loop-discharging tail withtheir points circumferentiall} spaced apart, and means restrainedagainst movement with said member for tempoeum'fe'rential channelintermediate their inner and outer faces and having their pointscircumterentially spaced apart, means restrained against movement withsaid member for temporarily bridging said points for transfer of theloop from one to the other, and means embraced by said channel fordetaining the thread-loop upon the tail of the loop-seizing member.

13. A sewing machine loop-taker comprising a loop-seizing memberconstructed with oppositelv directed loop-seizing beak andloopdischarging tail tormed with a circumferential channel intermediatetheir inner and outer faces and having their points circumterentiallyspaced apart, llltlIlS re strained against ,movement with said membertor temporarily bridging said points for transfer ot the loop from oneto the other. means operating in said channel for distending athread-loop seized by said beak. and means also operating in saidchannel tor detaining said thread-hmp upon the tail of the loop-seizingmember after transfer thereto jtrom said beak.

14. A sewing machine loop-taker comprising a loopsei7.ing memberconstructed with oppositely directed loop-seizing beak andlool'i-discharging tail tormed with a circumferential channelintermediate their in her and outer faces and having their pointseircumt'erentially spaced apart, means restrained against movement withsaid member tor temporarily bridging said points for transter ot' theloop from one to the other, a threzul-case journaled in said loop-takingmember, a loop-distending beak sustained bv said thread-case andentering said channel tor cooperatitm with the beak ot said member, anda loop-detaining finger also sustained by the threml-ea e and enteringsaid channel tor coaction with the tail of said member.

1! A sewing machine loop-tal er cone prising a loopseizing memberconstructed with oppositely directed loop'seixing beak andloop-discharging tail formed with a cireumi'erentiat channelintermediate their inner and o'ter faces and having their pointseiremn'tercntially spaced apart, means restrained against movement withsaid member tor temporarily bridging said points tor transfer of theloop from one to the other. a thr-ad case journaled in said loop-tal ingmember, and a disk secured to the bottom of said threada-ase andprovided with circumijerentially spaced loop-distending beak and looaletaining tinge! entering said channel and cooperating respectivelywith the beak and tail of said member in distending a thread-loop anddetaining the same in a loop-casting operation.

16. t loop-seizing member for sewing machines constructed withoppositely directed loop-seizing beak and loop-discharging tail withtheir points cireumferentially spaced apart, and a thread-case journaledin said member and provided with a loopguard overhanging the paths ofmovement of said beak and tail. i

17. In a sewing machine, the combination with a loop-seizing memberconstructed with oppositely directed loop-seizing leak andloop-discharging tail with their points circumferentially spaced apart,and a sta tionary thread-case journaled in said member and provided witha loop-guard overhanging the paths of movement of said beak and tail, ofa stationary loop-controller sustained independently of and adjacent anextremity oi said loop-guard and cooperating therewith in the dischargeof the loop from said guard.

19. In a sewing machine, the combination with a loopseizing memberconstructed with oppositely directed loop-seizing beak andloop-discharging tail with theirpoi'nts cireumi'erentially spaced apart,and astationary thread-case journaled in said, menu ber and providedwith a loop-guard overhanging the paths of movement of said beak andtail and terminating in a lateral discharge-finger. of a stationaryloop-coir troll er sustained independently of said loopguard andadjacent and intermediate the ends of said discharge-finger.

19. In a sewing machine. the combination with a loop-seizing memberprovided with a beak, and a thread-ease journaled therein and providedwith a loop-guard terminating in a late :11 discharge-finger, of athroatplate having a loop-controlling spur depending therefrom anddownwardly inclined relatively to the path of movement of said beak withits extremity adjacent but spaced from the middle portion of said fingerintermediate its ends.

20. In a sewing machine. the combination with a loop-seizing memberprovided with a beak, and a thread-case journaled therein and providedwith a loop-guard terminating in a lateral discharge-finger. ot' athroats plate having a needle-hole and recessed adjacent the same in itsunder face to receive the point of said finger and provided with adepending loop-controlling spur downwardly inclined relatively to thepath of movement 01 said beak with its extremity tltljtlttllt but spacedtrom the middle portion 01' said finger intermediate its ends.

21. In combination in the stitch-forming mechanism of a sewing machine,a primary hook provided with a cast-off incline, a beak, acircumferential channel formed in the wall of said hook and extendingintosaid beak, and a secondary hook provided with a beak which extendsintosaid channel. the beaks of said hooks operating in the making of astitch to arrest the limb of the loop of needlethread running from thework at or near the cast-off incline. and to carry the other limb ofsaid loop running from the eye of the needle to the base of the beak ofthe secondary hook and cast the same around the bobbin-case.

'22. In a sewing machine. a stitch-forming mechanism comprising aprimary hook provided with a beak. means for carrying a locking threadand a channel formed in its wall the depth of which extends parallelwith the axis about which the hook moves. astop on the beak of the hookfor engaging one limb of the needle-thread loop.'and an auxiliary hookoperating in said channel for engaging the other limb of said loop.

23. In a sewing machine, a stitch-forming mechanism comprising a primaryhook having a channel formed in its wall concentric with its axis. and aslot oblique to said axis which passes through the walls of the channeland thereby forms a beak for the hook. a stop operating in connectionwith the beak for preventing one limb of the needle-thread loop fromsliding down the oblique slot. a bobbin-case carried by said hook. and asecondary hook located wholly within the circumference of the primaryhook and provided with a beak which operates in said channel to causethe other limb of the loop to slide down the oblique slot.

24. In a sewing machine. a stitch-forming mechanism comprising a hookprovided with a channel the depth of which in a direction at rightangles to the plane in which the hook revolves and an oblique slotpassing through the walls of said channel by means of which a beak isformed on the hook. a bridge across said oblique slot intermediate thepoint and the base of the hook. and a secondary hook operating in saidchannel.

25. In combination in the stitch-forming mechanism of a sewing machine.a primary hook provided with a beak and an adjacent cast-off incline andhaving a channel formed in its wall the depth of which extends parallelwith the axis of the book. a secondary hook operating in aid channel.and a stop on the beak of said primary hook between its point and basefor arresting one limb of the loop of needle-thread and thereby causingit to be engaged by said cast-ofl' incline.

26. In a sewing machine. a stitch-forming mechanism comprising a primaryhook provided with a beak and a tail and having a channel formed in itswall the depth of which is in the direction of the rotating axis of thehook, an auxiliary hook disposed so its beak is in said channel, andmeans whereby the loop of needle-thread as it is being discharged passesfrom the beak of the primary hook upon its tail.

2?. In combination in the stitch-forming mechanism of a sewing machine.a primal" hook provided with a beak and an oppositely directed tail andhaving a circumferential channel formed therein, and a part locatedwithin the circumference of said hook and provided with a plurality ofloop-engaging elements which operate in said channel.

28. In combination in the stitch-forming mechanism of a sewing machine.a primary hook provided with a beak and a tail and with an annularchannel entering the same, a secondary hook adapted to operate in saidchannel. means for causing the loop of thread as it is being dischargedto be caught on said tail. and means for controlling the delivery ofsaid loop from said tail which comprise a part operating in saidchannel.

29. In combination in a stitch-forming mechanism of a sewing machine. aprimary hook provided with a beak and a tail and with a circumferentialchannel formed in its wall. a secondary hook that operates in saidchannel. a thread-guard which causes the loop of needle-thread to passfrom the beak of the primary hook to the tail. a needleplate. aprojection or finger extending from said needle-plate so located thatthe loop passes from the tail to said projection. and a finger extendingupwardly from said guard so located that the loop passes from the sameto the said finger and from thence to the work.

30. In a sewing machine. a stitch-forming mechanism comprising acylindrical member having a channel in its wall and provided with a beakhaving its point at the periphery and also at the outer end of saidmember and its throat nearer to the point of the beak than to theopposite end of said member. said member being formed with a cast-ofi'incline also extending to its outer end. a bobbin-case journaled in saidmember, and an auxiliary hook which operates in said channel.

31. A sewing machine loop-taker comprising a rotary memberprovided witha loopsei Aing beak and a thread-case journaled therein. means beingprovided whereby in the initial quadrant of rotation of said member aloop seized by said beak is engaged intermediate the ends of thethread-case and oppositely distended to the extreme ends of thethread-case preparatory to being cast about the lattei by continuedmovement of said beak.

32. A sewing machine loop-taker comprising a cup-shaped loop-seizingmember constructed with a thread-cavity and with a beak having a throatin the forward portion of said member and with an annular channel in itswall extending through said beak, means being provided between the endsof and wholly exterior to the periphery ofsaid member for deflecting anouter limb of a thread-loop from said throat over the forward end ofsuch member, and means restrained against rotation witir said member andenteringsaid channel therein for distending the inner limb of said loopover the rearward end of said thread-cavity. 33. A sewing machineloop-taker comprising a cup-shaped loop-seizing member constructed witha thread-cavity having an annular thread-case bearing adjacent itsforward end and a beak crossing said bearing and having its point andthroat closely adjacent to and at opposite sides of said bearing. meansbeing provided upon the exterior of said member for deflecting a limb ofa thread-loop engaged by said throat over the forward end of saidmember. and means disposed within the periphery of said member fordistending the other limb of said loop backwardly to the rear of saidcavity.

3i. In a sewing machine. the combination with a loop-seizing memberconstructed with a beak, of a thread-ease embraced by said member andprovided with a loop-guard overhanging the path of movement of said beakupon the castotl' side of the thread- 35. In a sewing machine. thecombination with a loop-seizing member constructed with a b eak. and athread-case embraced by said member and provided with a loop-guardoverhanging the path of movement of said beak upon the cast-ofl' side ofthe threadcase, of a stationary loopcontroller sustained independentlyof and adjacent an extremity of said loop-guard and cooperatingtherewith in the discharge of loops from said guard.

36. In a sewing machine loop-taker, the combination with a rotaryloop-seizingmember formed with an annular bearing. of a thread-caseformed adjacent its forward end with a peripheral flange fitted to saidbearing and with a loop-guard extending laterally beyond the peripheryof said member upon the side upon which the thread loops are. cast offby the latter. said threadcasc sustaining upon its opposite end a loopdistending hook cooperating with said meniber in the 'asting of thethread-loops around the thread-case.

37. In a sewing machine loop-taker, the combination with a rotaryloop-seizing member formed with an annular bearing, of athread-case,journaled in said bearing and provided upon the side upon.which the thread-loops are cast off by said member with a loop-guardextending forwardly of the outer end and laterally beyond the pe;

riphery of said loop-seizing member, and a tension-spring mounted uponsaid loopguard and exposed at the outer side thereof.

38. In a sewing machine loop-taker, the combination with a rotaryloop-seizingmember formed with a beak and with a threadcavity having anannular bearing, of a thread-case journalcd in said bearing and providedupon the side from which the beak moves in seizing a thread-loop with aloopguard extending laterally beyond the periphery of said member andterminating in a substantially radial discharge-finger adjacentloop-seizing position.

3!). ln a sewing machine loop-taker, the combination with a rotaryloo'p-seizingmember formed with a beak and with a threadcavity having anannular bearing, of a thread-case journaled in said bearing and providedupon the side from which the beak moves in seizing a thread-loop with aloopguard comprising a segmental pla'te secured to but spaced from thewall of the threadase and provided with an aperture, and atension-spring secured upon said loop-guard and having a portionextending through said aperture of the loop-guard for engagement withthe thread-case.

it). In a sewing machine loop-taker, the combination with a rotaryloopseizingmember formed with a beak and with a threadcavity having anannular bearing, of a thread-case journalcd in said bearing and providedupon the side from which the beak moves in seizing a thread-loop with aloop guard comprising a segmental plate secured to but spaced from thewall of the threadcase and provided with an aperture and withtransversely notched studs at opposite sides of said aperture upon itsinner face for directing the thread across said aperture. and atension-spring secured upon said loop-guard and having a portionextending through said aperture of the loop-guard for engagement withthe thread-case.

ll. In a sewing machine loop-taker, the combination with a rotaryloop-seizingmenb ber formed with a beak and with a threadcavity havingan annular bearing. of a thread-case formed with a peripheral flangetitted to said bearing and provided with a segmental lubricant holdingrecess havinga peripheral distributing slit leading to said bearing.

42. In a sewing machine loop-taker, the combination with a rotaryloop-seizing member formed with a beak and with a thread-cavity havingan annular bearing. of a thread-case constructed with a cylindrical sidewall having a thread-slit extending from theouter end toward the bottomthereof and provided with a peripheral flange crossing said thread-slitand fitted to said bearing and formed with a transverse thread-clearanceaperture adjacent the thread-case Wall at said :thread slit.

43. In a sewing machine, a stitch-forming mechanism comprising arevolving hook provided with a bobbin-case, a loop-guardspring mountedupon the bobbin-case, and a bobbin-thread tension attached to theloopguard. v

44. In a sewing machine, a stitch-forming mechanism comprising a rotaryhook provided with a bobbin-case, a loop-guard attached to saidbobbin-case, a passage being provided for the bobbin-thread intermediatethe bobbin-case and the loop-guard,'means for guiding the bobbin-threadalong a predetermined way to the work. an opening through theloop-guard, and a tensionspring attached to the loop-guard operatingthrough said opening to engage the bobbin thread.

45. In a sewing machine, a stitch-forming mechanism comprising a rotaryhook, a bobbin'case journaled therein and provided with an oblique slot.a loop-guard attached to the bobbin-case which extends over said slot,and means in combination with the loop-guard for retaining thebobbin-thread in the slot and permitting it to move along the slot asthe thread unwinds from one to the other side of the bobbin.

46. In a sewing machine, a stitch-forming mechanism comprising a rotaryhook, at

bobbin-case journaled thcrein and formed with an oblique slot. aloop-guard attached to said bobbin-case which extends over said slot, adownwardly projecting stud carried by the loop-guard and having a slotin its free end, means for guiding the bobbinthread to said slot in thefree end of said stud as the bobbin-case is being threaded, and meansfor retaining the thread in said slot.

47. In a sewing machine, a stitch-forming mechanism comprising a hookwhich rotates about a horizontal axis in a direction toward the back ofthe machine. a bobbin-case carried by said hook and formed with anoblique slot which constitutes a part of the means by which the case isthreaded. said slot located in the part of the case which extendsfromits axis toward the front of the machine, and means for retaining thebobbin-thread in said slot and guiding it therefrom to the work.

48. In a sewing machine, a stitch-forming mechanism comprising a hookwhich rotates about a horizontal axis, a thread-case carried by saidhook and provided with a peripheral portion extending forwardly of thehook, and means carried by said forwardly extending portion of thethread-case whereby the latter may be threaded without removal from thehook.

49. In a sewing machine, a stitch-forming mechanism comprising a primaryhook provided with a channel formed in its wall. a bobbin-case carriedby said hook. a secondary hook carried'by the bobbin-case and operatingin said channel. a segmental loopguard carried by the bobbin-case whichhas a laterally extending flange. and a finger or part extending fromsaid loop-guard to the under side of the throat-plate near theneedle-passage.

50. In a sewing machine loop-taker. the combination with a rotaryloop-seizing member formed with an annular bearing. 0 a thread-casejournaled in said hearing and provided with a forwardly extendingloopguard having a loop-absorbing flange extending outwardly therefrom.away from the axis of the loopscizing member. and beyond the peripheryof said member.

51. In a sewing machiiie looptaker. the combination with a rotaryloop-seizing member formed with a beak and with a thread cavity havingan annular bearing. of a substantially cylindrical thread-case journaledin said bearing. a loop-guard sustained by said thread-case and formedwith a forwardly extending segmental portion corresponding substantiallyin curvature with the wall of said cylindrical thread case.

In testimony whereof. I have signed my name to this specification. inthe presence of two subscribing witnesses.

\VILLIAM PARKER 'itnesses I'IENRY J. MILLER, H. A. KORNEAIANN, Jr.

